echo "notify-send 'Need to check kitchen in 10 min'"| at now + 10 minutes

Lock screen: loginctl lock-session
Unlock screen: loginctl unlock-session

kdeconnectd can help you manage sound volume, change song, also you can add more command for remote lock/unlock screen or turn off computer (laptop):

sudo dnf install kdeconnectd

Add to firewall:

sudo firewall-cmd --zone=public --permanent --add-port=1714-1764/tcp
sudo firewall-cmd --zone=public --permanent --add-port=1714-1764/udp
sudo systemctl restart firewalld.service


on Android phone you need install KDE Connect and than you need pair devices to access all features of remote management.

loginctl terminate-user your_user_name

kbuildsycoca4 && kquitapp plasma-desktop && kstart plasma-desktop

Witch KDE version you are using?

kde4-config -v
Qt: 4.8.5
KDE Development Platform: 4.10.5
kde4-config: 1.0

or

kded4 –version